ORS 109.747: Jurisdiction to modify determination.

Except as otherwise provided in ORS 109.751, a court of this state may not modify a child custody determination made by a court of another state unless a court of this state has jurisdiction to make an initial determination under ORS 109.741 (1)(a) or (b) and:

      (1) The court of the other state determines that it no longer has exclusive, continuing jurisdiction under ORS 109.744 or that a court of this state would be a more convenient forum under ORS 109.761; or

      (2) A court of this state or a court of the other state determines that the child, the child’s parents and any person acting as a parent do not presently reside in the other state.